Improvement in spectacle-bow hinges



J, S. SPENCER. Spectacle-Bow Hinge.

No. 217,420. Patented July 8,1879.

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WITNESSES! INVENTOR.

-N PET8S, FHQTO-LITHOGRAPHER, WASHINGTON D c LUNITED STATES PATENTOFFICE.

JOHN-S. SPENCER, OF NEW YORK, N. Y.

IMPROVEMENT IN SPECTACLE-BOW HINGES.

Specification forming part of Letters Patent No. 217,420, dated July 8,1879; application filed J nne 4, 1879.

To all whom it may concern:

Be it known that I, JoHN S. SPENCER, of the city of NewYork, in theState of New York, have invented a new and useful Improvement in theHinge of Spectacle-Bows, which improvement is fully set forth in thefollowing specification, reference being had to the accompanyingdrawings.

The object of my invention is to cause the bow to retain until worn outthe same fi rmnose and accuracy of movement as when new, and prevent itfrom becoming loose by Wear.

The end of the bow-piece designed to ork as a hinge is placed under adie, and cut in the form of a Maltese cross, as shown in Figure 1. Themiddle of the upright A is then sawed out to a certain distance belowthe arms on, as shown in Fig. 2, leaving the two sides b b b I), whichare spread a little, forming two distinctive springs. When placed in thesocket of the spectacle-frame the arms a a fit in ,the pin-holes d d,Figs. 3 and 4, forming the turning-pin for the hinge and holding the bowin its place. The springs b b b b pressing against the sides of thesocket prevent the bow from becoming loose from wear.

The end of the spectacle-frame containing the socket is made in twopieces, for conven ience of admitting the arms 01. Ct to the pinholes,and then brought together by a screw at f, Figs. 3 and 4.

It will be evident that by the constant outward pressure of the springsb b b b, and the arms a a being of the same piece as these springs, thehow will retain its original adjustment and regularity of movement, andthe process is simpler than the ordinary method of swaging up the end ofthe bow and then drilling a hole and putting in a pin.

I claim as my inventionr The springs and pins cut from the same piece ofsteel, by which the bow is held firmly in place without swaging andwithout sepa' rate pin, substantially as described.

1 JOHN S. SPENCER.

Witnesses:

MARCUS P. BESTOW, W. R. DENsLow.

